At the end of November Reading and Leeds festival broke from their normal tradition and announced some headliners prior to the usual protocol of it happening in March right before tickets go on sale. In that they said Deftones, Alt-J, Subfocus and Boy Better Know featuring Wiley, Skepta and JME. Today they've announced another and it's a biggie. Returning to the festival for the first time since 2001, Eminem will take centre stage with a full band behind him. It's sure to be a popular addition to the festival and a highlight of the 2013 summer calendar. Others rumoured to be performing include Blur and Black Sabbath. This could shape up to be one for the books.